Fluid delivery device



Oct. 28, 1941. L. H. CU$HMA N FLUID DELIVERY DEVICE Filed Dec. 29, 1939 Patented Oct. 28, 1941 FLUID DELIVERY DEVICE Lee Harold Cushman, Hamilton, Mass., assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application December 29, 1939, Serial No. 311,628

2 Claims.

This invention relates to fluid delivery devices from which fluid is delivered in a jet or spray, and is herein illustrated as embodied in a device for delivering a jet of oil for lubricating purposes. It will be recognized, however, that the invention is not limited to lubricating means, but is adapted for various uses.

An object of the invention is to insure that if an orifice through which fluid is delivered'becomes wholly or partially obstructed by dirt or other foreign matter, the orifice will be immediately cleared to permit normal delivery of the fluid. To this end, the construction herein shown comprises a casing provided with a chamber which receives fluid under pressure and having an orifice through which the fluid is delivered from the chamber, and a member which extends into and partially closes the orifice in contact with the wall thereof during normal delivery of the fluid but is moved automatically in the direction to withdraw it from the orifice in response to increase in the pressure of the fluid in the chamber if there is any obstruction to the normal delivery of the fluid. Such movement of the member may serve to dislodge any foreign matter in or adjacent to the orifice, or its movement may continue until an enlarged opening is provided through which the foreign matter will be discharged. When the orifice is cleared, the member is immediately returned by a spring to its normal position.

The invention will now be more particularly described with reference to the accompanying drawing and thereafter pointed out in the claims.

In the drawing,

Fig, 1 is a view partly in elevation and partly in vertical section of a device in which the invention is embodied, showing the parts as they appear during normal delivery of the oil;

Fig. 2 is a View also in vertical section of a portion of the device, illustrating conditions when delivery of the oil is obstructed; and

Fig. 3 shows the device as viewed in the direction of the arrow in Fig. 1, a portion of the structure being broken away.

The device comprises a casing 2 which, for the purpose of lubricating parts of a machine, is adapted to be mounted in an enclosure where such parts are located, the drawing showing a portion 4 of the frame of such a machine on which the formed one wheel l2 to cause the wheel to rotate and disperse the oil about the enclosure in which the device is located, so that oil will be deposited on the parts to be lubricated. The wheel I2 is mounted to turn freely about a pin I supported by an arm I6 which is secured by a set screw IS in an opening in the casing 2.

To permit delivery of oil from the chamber 6 the casing 2 is provided with an orifice 20 (Fig. 2) which includes a substantially cylindrical hole 22 and. a small slot 24 at one side of this hole. Slidingly mounted in the casing is a plunger 26 which serves as one end wall of the chamber 6 and has extending therefrom a pin 28 formed substantially to fit in the hole 22 while freely movable in the hole. Formed in one side of the pin 28 is a slot 30 which is opposite the slot 24 in the casing 2, so that the two slots cooperate to provide a restricted channel or passage 32 (Fig. 3) through which the jet of oil issues when the pin 28 is in the hole 22. The slot 30 is maintained in the right relation to the slot 24 by a pin 34 (Fig. 1) which projects from the casing 2 into a slot 36 in the plunger 26 and thus prevents the plunger from turning. A spring 38 bearing at one end on the plunger 26 and at the other end on a screw 40 threaded in the lower end of the casing 2 holds the plunger at all times during normal delivery of the oil in a positiondetermined by its engagement with a shoulder 42 on the casing, as illustrated in Fig. 1. The pin 28 is thus positioned in the orifice 20 and partially closes the orifice while in contact with the wall thereof, permitting the oil to be delivered through the restricted channel 32. Should any dirt or other foreign matter wholly or partially obstruct this channel and thus prevent normal delivery of the oil, the pressure of the oil in the chamber 6 increases, and such increase in the pressure serves to move the plunger 26 against the resistance of the spring 38 in the direction to withdraw the pin 28 from the orifice 20, as illustrated in Fig. 2. In such movement the pin may act frictionally to dislodge the foreign matter obstructing the flow of the oil, or the movement of the pin may continue until it is withdrawn from the orifice so that the foreign matter will be discharged through the enlarged opening thus provided. As soon as normal flow of the oil through the channel 32 is again permitted, the plunger 26 is returned by the spring 38 to its normal position by reason of the decrease in the pressure of the oil in the chamber 6. Insurance is thus afforded against anything more than a momentary cessation of the normal delivery of the oil.

Having described the invention, what I claim as new and desire to secure by Letters Patent of the United States is: s

1. In a fluid-delivery device, a casing having therein'a chamber to receive fluid under pressure and provided with an orifice through which fluid is delivered from said chamber, a plunger movable in said casing in engagement with the 'side walls thereof, and a, member arranged to extend from said plunger outwardly into said orifice in contact with the wall of the orifice nearly all around the member during the normal delivery of the fluid, said member and the orifice being so formed as to provide at one side only of the member a restricted passage for the fluid when the member is thus located in the orifice,

the member being movable inwardly by the plunger in the direction to withdraw it from the orifice in response to increase in the pressure of the fluid in said chamber in the event of an obstruction to the normal delivery of fluid through said passage. s v y with each other to provide a restricted passage for the fluid at one side only of the pin when the pin is thus located in the orifice, and a spring for holding the plunger in its normal position. the

plunger being movable against the resistance of said spring in the direction to withdraw the pin inwardly from the orifice in response to increase in the pressure of the fluid in said chamber in the event of an obstruction to the normal delivery of fluid through said passage.

LEE HAROLD CUSHMAN. 

